OpenStreetMap

Mapping west Cornwall

Posted by Steven Whitehouse on 28 February 2009 in English (English)

I'm just back from a week in Cornwall, during which I've managed to gather large amounts of useful GPS data every day. Since I didn't have Internet access while I was there, I now have the task of updating the map based on the tracks and the copious notes I took at the time.

It seems like Cornwall in general has a long way to go before its up to the same standard as the areas around where I live in Swansea. I hope that this last week's activities will go some way towards fixing this.

One of the great advantages of visiting Cornwall at this time of year is that there are few other visitors, and taking detours down the many single track country lanes isn't such a problem as you are far less likely to meet something coming the other way :-)

I also visited the second hand book shops in search of out of copyright maps of the area. I have a street plan of Penzance which looks useful as not too much has changed. The plan of St. Ives in the same book, though, looks like its not going to be of any real use, which is a pity.

I'd love to go back and do a bit more mapping there, but next time I'll try and find some accommodation which is on the Internet as that makes things a lot easier.

Comment from LivingWithDragons on 5 March 2009 at 20:32

If you use JOSM: You can download an area (might have to do several zoomed areas to end up with a large amount of Cornwall). File, Save As (a .osm file). You can then open that file offline and bring in your gpx files as you make them. Once you have edited them offline, do another File, Save As. When your back home open up the .osm fiile in josm once more and click the upload button. It should deal with any conflicts that might come about if someone did some mapping during the time since you first downloaded/saved the osm file, you might have to manually notice some mistakes.

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Comment from Steven Whitehouse on 6 March 2009 at 11:47

Yes, and in fact I did download the data with josm first. The only issue was that I didn't trust it to merge things correctly. As a result I saved my "notes" in the form of another, overlay, .osm file while I was there and used that to copy & paste the larger items (mostly car park outlines) when I returned.

I've been having a bit of a fight with josm over relations and the South West Coast Path in particular, but I think I'm not too far from resolving that now that I've read some of the info which people have posted on the issue. I think probably josm is not keeping the relations and the ways in sync so that the upload fails if I make certain changes.

I think I should have that fixed shortly, and there are only a couple of small sections of path which are not currently quite correct.

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